How many atoms in 0.400 g of Phosphorous 2 Oxygen 5?

Answer 1

The gram molecular mass of P2O5 is 141.94, and each molecule contains 7 atoms, as shown by adding the subscripts in the formula. 0.400 grams constitutes 0.400/141.94 or about 2.812 X 10-3 mole, and the number of atoms is therefore the product of this number of moles, 7, and Avogadro's Number, or about 1.19 X 1022 atoms, to the justified number of significant digits.

Answer 2

To find the number of atoms in a compound, you need to first calculate the number of moles of the compound. Then, use Avogadro's number (6.022 x 10^23 atoms/mol) to convert moles to atoms. In this case, for Phosphorous 2 Oxygen 5, you would first calculate the molar mass, find the number of moles from the mass given, and finally convert moles to atoms using Avogadro's number.